That would be silicon, or SiO2
The second most abundant element in the Earth's crust is silicon, comprising 27.8% of the crust by mass.
silicon.
That element is Oxygen by 46.6%
calcium is!
Silicon is the second most abundant element on earth. Silicon dioxide and silicates (salts derived from silicon dioxide) make up approximately 87% of the materials in the earths crust. Oxygen is the most abundant, making up slightly less then 50% of the total mass of the earth's crust, waters, and atmosphere.
The most abundant metal in the earth crust is aluminium.
Silicon
Silicon is the second most abundant element in Earth's crust.
silicon
Aluminum 7.5 to 8.1%
Siliconsilicon at 28%silicon!
goyttret